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A new process of recovering acid and alkali from viscose fiber sodium sulfate waste liquid by bipolar membrane electrodialysis

A bipolar membrane electrodialysis and sodium sulfate waste liquid technology is applied in the field of viscose fiber production to achieve the effects of prolonging service life, improving service life and reducing damage

Active Publication Date: 2015-09-16
宜宾海翔化工有限责任公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention aims to solve the existing problems and defects in the existing technology of recovering acid and alkali through bipolar membrane electrodialysis for the waste liquid produced in the forming process of viscose fiber strands, and provides a viscose fiber sodium sulfate waste liquid The new process of recovering acid and alkali by bipolar membrane electrodialysis is only for the process of producing acid and alkali from waste liquid produced in the process of forming viscose fiber strands through bipolar membrane electrodialysis, and adopts a specific recovery method. The pretreatment step in the recovery method handles the waste liquid produced in the viscose fiber strand molding process, and then enters the bipolar membrane electrodialysis process, which improves the regeneration recovery rate of acid and alkali in the viscose fiber waste liquid, reduces Eliminate the damage to the bipolar membrane caused by waste liquid impurities, improve the service life of the bipolar membrane, and ensure the smooth progress of bipolar membrane electrodialysis and subsequent processes

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0037] A new process for reclaiming acid and alkali from viscose fiber sodium sulfate waste liquid through bipolar membrane electrodialysis, including the following steps in turn: crystallization, pH adjustment, primary filtration, O 3 Redox substances, secondary primary filtration, activated carbon to remove organic matter, ion exchange resin to remove zinc ions, pp microporous filtration and fine filtration, acid and alkali preparation and concentration;

[0038] Described crystallization is that the waste liquid that sodium sulfate content is 200g / L is generated sodium sulfate crystal through high-temperature crystallization by viscose fiber strand forming process;

[0039] The pH adjustment is to first dissolve sodium sulfate crystals with desalinated water to obtain a sodium sulfate solution with a concentration of 3%, then add sodium carbonate to the sodium sulfate solution, adjust the pH value of the solution to 8, and add sodium carbonate to dissolve the sodium sulfate ...

Embodiment 2

[0059] A new process for reclaiming acid and alkali from viscose fiber sodium sulfate waste liquid through bipolar membrane electrodialysis, including the following steps in turn: crystallization, pH adjustment, primary filtration, O 3 Redox substances, secondary primary filtration, activated carbon to remove organic matter, ion exchange resin to remove zinc ions, pp microporous filtration and fine filtration, acid and alkali preparation and concentration;

[0060] Described crystallization is that the waste liquid that sodium sulfate content is 300g / L is generated sodium sulfate crystal through high-temperature crystallization by viscose fiber strand forming process;

[0061] Described adjusting pH is to first dissolve sodium sulfate crystal with desalinated water, obtain the sodium sulfate solution that concentration is 7%, then add sodium carbonate in sodium sulfate solution, the pH value of solution is modulated 9, add sodium carbonate and sodium sulfate solution can be The ...

Embodiment 3

[0081] A new process for reclaiming acid and alkali from viscose fiber sodium sulfate waste liquid through bipolar membrane electrodialysis, including the following steps in turn: crystallization, pH adjustment, primary filtration, O 3 Redox substances, secondary primary filtration, activated carbon to remove organic matter, ion exchange resin to remove zinc ions, pp microporous filtration and fine filtration, acid and alkali preparation and concentration;

[0082] Described crystallization is that the waste liquid that sodium sulfate content is 300g / L is generated sodium sulfate crystal through high-temperature crystallization by viscose fiber strand forming process;

[0083] Described adjusting pH is to first dissolve sodium sulfate crystal with desalinated water, obtain the sodium sulfate solution that concentration is 12%, then add sodium carbonate in sodium sulfate solution, the pH value of solution is modulated 9, add sodium carbonate and sodium sulfate solution can be T...

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Abstract

The invention discloses a novel viscose sodium sulfate waste liquor acid and alkali recycling technology by virtue of a bipolar membrane electrodialysis method. The technology is characterized by sequentially comprising the following steps of: crystallizing, pH regulating, first primary filtering, oxidizing reducing substances with O3, secondary primary filtering, removing organic matters with activated carbon, removing zinc ions with ion exchange resin, refined filtering with a propene polymer (pp) millipore filter, and acid and alkali producing and concentrating. By virtue of the technology, the regenerating and recycling rates of acid and alkali in viscose sodium sulfate waste liquor are improved, the damage of waste liquor impurities to a bipolar membrane is alleviated, the service life of the bipolar membrane is prolonged, and the bipolar membrane electrodialysis and subsequent processes can be successfully carried out.

Description

technical field [0001] The present invention relates to a method for material treatment in chemical production, more specifically, the present invention relates to a new process of recovering acid and alkali from viscose fiber sodium sulfate waste liquid through bipolar membrane electrodialysis, which belongs to viscose fiber production technology field. Background technique [0002] In the viscose fiber forming process in the chemical fiber industry, the viscose and the acidic coagulation bath interact to neutralize the alkali, decompose the sodium cellulose sulfonate and regenerate hydrated cellulose, and the cellulose sulfonate in the viscose during this process Ester, free NaOH, and Na produced by side reactions 2 CS 3 Side reaction products such as polysulfides and polysulfides will react with sulfuric acid in the coagulation bath to generate sodium sulfate. Viscose fiber production includes the acid bath process that consumes sulfuric acid, and also includes the pul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F13/02B01D61/44
CPCY02P70/62
Inventor 邓传东易家祥朱小川胡小东李殿洪罗凯
Owner 宜宾海翔化工有限责任公司
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